Coin-controlled television



Oct. 9, 1951 1. KoRNBl-:RG Erm.

COIN coNTRoLLED TELEVISION Filed Feb. 24. 1948 2 Sheets-Sheet l INVENTORS KORNBERG IRVLNG Oct. 9, 1951 l. KORNBERG ETAL 2,570,821

COIN CONTROLLED TELEVISION Filed Feb. 24, 1948 Y 2 sheets-sheet 2 TELEVISION CIRCUIT 1N VEN TORJ' RVING KORNBER@ BY ARTHUR BLo 0M ATUHMEY Patented Oct. 9, 1951 COIN-CONTROLLED TELEVISION Irving Kornberg and Arthur Bloom, Brooklyn, N. Y.

Application February 24, 1948, Serial No. 10,434

8 Claims.

This invention relates to a television set, and more particularly to a coin-operated television set which is adapted to operate for a specified length of time only after deposit of a coin.

An object of the present invention is to pro- ,vide a television set and means Vfor controlling the operation thereof to the end that the television set can be used commercially to provide a certain active period for a certain sum of money.

Another object is to provide a coin control mechanism for a television set which will permit use of the set for a certain period of timey in response to the deposit of a certain amount of vmoney, which mechanism avoids the use of complicated delayed action devices and permits one cycle to run from start to nish while controlling the passage of the coin from the slot to a storage drawer.

A further object is to provide a mechanism as aforesaid in which a rotary cam actuates a laterally swingable lever to .permit dropping of the coin from the coin slot into a drawer, the dropping of the coin breaking the electric circuit and cutting off the set.

Still another object of this invention is the provision of an electrically controlled means for locking the station selector against movement during the time the television set is in operation and for holding the selector against movement until the inserted coin is released.

It is a further object of this invention to arrange the station selector so thatit is free to be moved in a manner Ito permit an individual to select a desired television station prior to the insertion of the coin.

Another object of the invention proposes a -signal lamp mounted on the front of the tele- Vision cabinet in close proximity to the screen and operated by the control mechanism in a man ner to visually indicate that the time allotted for the inserted coin is about to come to an end.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to lthe following description and accompanying drawings, and to the appended claims in which the various novel -feal tures of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure;

Fig. 1 is a front view of a television set, partly broken away to show rthe coin-control mechanism thereof.

Fig. 2 is a section on the line 2-2 of Fig. 1.

Fig. 3 is a plan view, partly in section, of a portion of the coin-control mechanism.

Fig. 4 is a perspectivel of the coin funnel.

Fig. 5 is an enlarged view of the switch elements in the funnel.

Fig. 6 is an enlarged fragmentary view of the cam control.

Fig. 7 is a partial vertical sectional View taken on the line 1 1 of Fig. l.

Fig. 8 is a vertical sectional view taken on the line 8--8 of Fig. '7.

Fig. 9 is a longitudinal sectional View of the switch controlling the signal lamp.

Fig. 10 is an enlarged detailed View of a portion of Fig. 9.

Fig. 11 is a wiring diagram of the television set constructed in accordance with this invention.

The television set IIJ, according to the present invention, includes a cabinet I I having a top wall I2, a bottom wall I3, side walls I4, a front wall I5 and a rear wall I6. The cabinet II of a conventional television set may be adapted to the features of the .present invention if there is sufcient room at the left side thereof. If not, the cabinet need only be extended a short distance at the left side to make room for the coin-control mechanism, indicated by the numeral I'I. In other words, it is a feature 0f the present invention that a conventional television set can receive the coin-control mechanism, or a slightly larger cabinet can be provided so that it can receive the coin-control mechanism. It is another feature of the invention that the coin-control mechanism is entirely at one side of the set.

A plate I8 is secured to Wall I4 in any desired manner. This plate is annular and receives a bearing journal I9 of a large gear 2U. A large headed screw 2I threaded in the journal I9 retains the journal in the annular plate. The journal may be retained in its bearing (the annular plate) in other ways, if desired. At the inner side of the gear 20 is a cam wheel 22 of a smaller diameter than the gear. This cam wheel is cylindrical and concentric with the gear and has, as its only cam surface, a knife-like tooth 23 which has a lateral beveled side Wall `providing the knife-edge 24.

The top or uppermost point of the gear 20 is in the center line of the top wall I2. Also in this center line, and spaced inwardly from the gear 20, is a pivotal depending clevis 25, the clevis having a stem 26 rotatably mounted in a bore in the top Wall I2 and retained therein by a screw 21 similar to but smaller than the screw 2 I.

A lever 28 is rigidly secured to the clevis by a rivet 29 so that it cannot pivot vertically in the clevis. This lever 28 has a bevelled end Van electric motor 45. `motor 45 vand the gear A2II greatly reduces the l.) overlapping the wheel 22, see Fig. 6, and this bevelled end provides a knife edge 35 adapted to be engaged laterally by the knife edge 24 as will later be described.

A coin funnel 3I is disposed in the same center line. This funnel has a peripheral top ilange 32 which is countersunk in the top wall I2. The two side walls 33 of the funnel are parallel and close, spaced'just the'width of a coin, such as a nickel, so that they will permit the coin to pass but will not permit it to tilt. One side wall',vv at its bottom, has a cut-out 34 through which Y the lever 28 passes when it swings laterally about the stem 26. The other side wall acts to stop the lever with its end in the cut-out, so that the lever obstructs the passage o-acoin -through the funnel. The lever is made of metal, but the clevis is made of insulating material. The fun-- nel is also made of insulating material, such as plastic. A spring 35, tensioned between the end of the lever having .the knife edge 39, and a rigid abutment 36 depending `from the top wall I2., urges the lever so that its end is inthe cutn out 34.

Below the lever and :funnel is disposed a coin drawer 31 slidable in guidesSB `depending ifrorn the wall I2. The drawer may open through'the back wall I and be locked in `any desired=man ner. A Z-shaped bracket 33 depends from the wall I2 on the above mentioned center line at `the opposite side of thefunnel from the `lever 28, and the funnel, at this side, is slitted, providn ing a :slot 39 `through whichthe adjacent :end vof the bracket 3B extends.

is secured on this end of the bracket. Y

Gear 12! meshes witha tiny gear 4i -on a Yshaft 42 journalled inV one sidewall VI4 and in an upright bearing post .43. .Shaft "42 carries a large gear 44 meshing with a tiny gear `i5 driven by The gearing between the driving 'speed so that gear 2@ turns at a Yvery slow rate.

In Figs l, 7 and 8, details ofthe mechanism for locking the video station selector ragainst movement, while the television `set is in operation, are illustrated. The station selector comprises the usual knob 41 located externally of .thefrontwall iiiof the television set I5 and which is connected with an operating rod A3 which extends to the interior `of the cabinet and `is connected with the usual station selecting mechanism, not shown on the drawings.

-A brake 'drum '49 is mounted on the operating rod 48 adjacent the vinside face ofthe front wall I5 and has a brake band 55 engaged:loosely.about itself `leaving the Arod I8 `and knob 471 free to `be rotated. One end of brake band 55 is -attached to Ya bracket 5I -mounted on the inside face of fthe front wall I5. AThe other end of the brake band 58 is positioned between a `pair of collars 52 Xedly mounted von the vmovable "core -53 of a solenoid 54. The solenoid is adapted to vbe supported upon the inside face of the front wall I5 by any suitable means.

A contraction spring 55 operates between a pin 56 mounted 'on themovable core 53 and a pin 5f'I mounted on the solenoid '54 for urging the movable core 53 into a -position in which the brake band 5@ is loose about the drum 'IISas shown in Fig. 8. The solenoid 54 is mounted in a circuit, hereinafter to be described, to be energized yby the insertion of a coin in ithe funnel 3I, to draw on Vthe movable core 53 against the action of the spring 55 to tightly engage :the brake A contact plate .-40-

4 band about the drum 49 and hold the operating rod 48 against being rotated while the television set is in operation.

The televisionY set is further provided with a red signal lamp 58 visible through an opening 59 in the front wall I5 just below the screen 60 in front of the picture tube 6I of the television set. 'This'fsigna-l lamp-58 ismounted in a circuit, Ato be hereinafterdescribed,operated by a switch 52 controlled by the tooth 23 on .the cam wheel 22 for igniting the lamp just prior to the time the tooth 23Yengages the lever 28 so as to indicate that the allotted time for the coin inserted is .about to end.

`Details of the switch 52 are given in Figs. 9 and l0. The switch 62 comprises a casing 63 of insulation material Yhaving an open end closed by a `.cover 54 threadedly engaged in position on the open end of the casing. Extending from the other end of the casing isla plunger :555, :constructed of conductive material,.fand having Ya beveled end 65e adapted to 'be -engagedby the tooth 23 for urgingtheplunger 55 .into thecasing 63 against the action ofV an expansion spring 65. The expansion spring =65 operates between a stud -61 on ,the inner end of the .plunger`5 and a stud 62 -on the insidefaceof the oover'l. A bracket 59 extends from the cover .54..for Y.attaching switch 62 `to the .top wall .I2 of the ltelevision cabinet in position :so 4that .the beveledend a ofv the plunger 65 extends into. .the ipath traversed bythe `tooth.23 on .the cam wheel.,22.

An .enlarged `head I D .formed .on the ,plunger ,-on inward movement .oftheplunger 55,..is;adapted to vcontact a conductor plate .1i vmounted .atithe side of the interior of the .casing-63. ,'lheplungelr and the conductor plate 'II are mounted .in a circuit, to be hereinafter described, forillumi- .hating the small red Ybulb-58 when .the .head 151 of the plunger 55contacts theconductor plate-7.1.

A dash-pot arrangement is provided `on 'the switch 52 -for retarding the ,return .movement of the plunger 65 so as'to 4hold the .circula-Qincluding the smallred bulb 58, lclosed fior agi-ven length -oi time. The .daslipot.comprises aho-le 'I2 formedin 4the cover -54 and ,having one end of a flexible strip "I3 Yextended thereover.` ,The strip 73 is attached tothe cover `54 by means .of a pin i4 at a point adjacent -the .hole.'I.2. free fend or the strip .is formedwth a smaller hole J5 in concentric alignment with .the .larger hole l2. When the plunger .55 Ais vpressed inwards the spring S5 will be compressed and the lair within the casing 53 will be discharged ,through the larger hole 3.2. 'On this movement `theiree end of `the .flexible strip 13 will `move .away `.from

facial contact with the cover 64 and permit-the air Vto Vfreely discharge through `the hole 1.2 :and not retard linward movement of the plunger 55. However, when the plunger `(i5 `is vclear of lthe too-th 23, thev outward movement of itheplunger 55 under the `force of the expansion `spring 16,6 will `be retarded retainingthe head 'I-) of the plunger G5 in electrical contact with the conduotor strip -'II :for a' longerperiodof time. This return movement will be retarded, because air wishing to enter the casing 63 to ll the partial vacuum created 4by the outward movement othe plunger 65, will draw the end/of theflex-ible strip 'i3 in facial contact with the cover :64 and over the larger hole l2, so that the -`air must first pass through the smaller hole 'i5 before entering `.the casing 53 through the larger `hole l2. Because :of the 4smaller capacity of "theusmaller hol`e'15, which allows 'less air to enter the casing 163 than TheV through the larger hole 12, the return movement of the plunger will be retarded.

The circuits of the present invention are shown in Fig. 1l. The circuits are characterized byione circuit 80 which connects in series the contact plate 40 on the bracket 39, the lever 28, the moto-r 46 and the solenoid 54 and a source of power. The source of power is the normal commercial 110 volt outlet receptacle into which the plug 8| is adapted to be inserted. When the circuit 80 is completed by a coin resting on the contact plate 4G and the lever 28, the motor 46 and the solenoid 45 will be'energized. A second circuit 82 connects in series the contact plate 40, the lever 28, the normal vcircuits of the television set and the source of power to also cause the television set to be set in operation. The circuits 80 and 82 include a common master switch 83 by which the entire set may be shut off when desired. A third circuit 84 includes in series the plunger 65, the conductor plate 'l I, the

small red bulb 58 and the source of power to light the bulb when the plunger 65 is urged inwardly to make contact with the conducto-r plate 1| and complete the circuit 84.

The operation of the television set is as follows:

A person wishing to use the television set to view a definite television program, first rotates the knob 41 of the video station selector to set the device for the desired station. A coin of the required denomination is dropped into the top of the funnel 3| to drop downward and rest on and bridge the contact plate 4l) and the lever 28. This completes the circuit 82 to the conventional television circuit setting the set in operation and, also, completes the circuit 80 energizing the motor 46 and the solenoid 54.

Immediately upon energization of the solenoid 54, the brake band 5D is drawn tightly about the brake drum 49 locking the video station selector against being rotated until the circuit 80 is again broken. Energization of the motor 46 will rotate the cam wheel 2B to measure the period of time that the set will operate for the coin inserted. As the cam wheel 20 continues to rotate, its tooth will rst engage and press in. on the plunger 65 to contact the conductor plate 1| and complete the circuit 84 and illuminate the small red bulb 58 to visually indicate that the allotted time for the coin inserted is about to end. Return movement of the plunger 65 will be retarded by the dash-pot arrangement previously described to retain the bulb 58 lit for a short period of time. The rotation of the cam wheel 22 will continue until the tooth 23 strikes and pivots the lever 29 to drop the inserted coin opening the circuits 80 and 82 shutting the device o. In view of the knife edges 24 and 38 on the tooth 23 and the lever 28, respectively, the tooth 23 will instantly drop the end of the lever 28 allowing the spring 35 to return the same to its normal position to coact with the contact plate 40 in retaining another inserted coin. f

The machine can be designed to be in operation for a certain specific length of time for an inserted coin of a given denomination. For example, the set may be one which will operate vfive minutes upon insertion of a ve-cent piece,

ten minutes upon insertion of a ten-cent piece, or for another desired combination. The same cam wheel 22 can be used for all combinations, it merely being necessary to change the gearing between the cam wheel 22 and the motor 45 so as to take the required time to move the cam Wheel 22 through one complete revolution.

From the foregoing, it will be seen that applicants have provided a simple type of coin-control mechanism for a television set, which effects a complete cycle upon the deposit of a coin without complicated clock and delayed action mechanlSmS.

While we have illustrated and described the preferred embodiments of our invention, it is to be understood that we do not limit ourselves to the precise constructions herein disclosed and the right is reserved to all changes and modiiications coming within the scope of the invention as defined in the appended claims.

Having thus described our invention, what we claim as new and desire to secure by United States Letters Patent is: l

1. A coin-operated television set comprising a cabinet of rectangular conguration, a large vertical gear journalled in one side wall of said cabinet, an electric motor supported on the bottom wall of said cabinet and carrying a small gear, an idler shaft mounted on said cabinet and having a large gear in mesh with said small gear and a small gear in mesh with said large gear for effecting slow rotation of said large vertical gear by said motor, a cam wheel carried by said vertical gear concentrically therewith, said cam wheel having a single thin cam having a lateral cam edge, a vertical clevis rotatably mounted in and depending from the top wall of said cabinet in line with the vertical center of said vertical gear, a lever rigid with said clevis for rotation therewith, one end of said lever having a vertical edge for coaction with said cam edge, said edges slightly overlapping, a coin funnel depending from said top wall in line with said clevis, said funnel having one side wall cut-out to receive the other end of said lever by said rotation thereof, a spring normally urging said lever other end into said cut-out, a contact opposite said lever other end adjacent said funnel and spaced therefrom a distance less than the diameter of a coin whereby a coin dropped in said funnel will bridge said lever other end and said contact, and a circuit connecting said lever, contact, motor, and a source of power, whereby said coin, on bridging said lever and contact, will close the circuit to energize said motor to rotate said cam wheel until said cam Wheel rotates 360 degrees bringing said edges into contact whereupon said lever will be swung laterally out of said cut-out to permit dropping of said coin.

2. A coin-operated television set comprising a cabinet of rectangular configuration, a large vertical gear journalled in one side wall of said cabinet, an electric motor supported on the bottom wall of said cabinet and carrying a small gear, an idler shaft mounted on said cabinet and having a large gear in mesh with said small gear and a small gear in mesh with said large gear for effecting slow rotation of said large vertical gear by said motor, a cam wheel carried by said vertical gear concentrically therewith, said cam wheel having a single thin cam having a lateral knife edge, a vertical clevis rotatably mounted in and depending from the top wall of said'cabinet at a point adjacent the top of said vertical gear, a lever rigid with said clevis for rotation therewith, one end of said lever having a vertical knife edge for coaction with a said cam knife edge, said knife edges slightly overlapping, a coin funnel depending from said top Wall in line with said clevis, said funnel having one side wall cut-.out to receive; the,A other end -of i saidvlever said rotationv thereof, aspring normallyurgingf, saidA lever other end into=saidcutout, a contact opposite said lever. other end adjacent said-- funneland 'spaced therefrom .a distance. less than the'. diameter of a; coin whereby a. coin dropped--l in said funnel Will bridgesaid lever other end andsaid contact, and a circuit connecting said lever.. contact, motor and a:source.of power in. series whereby said coin, on bridging said'leverand.- contact, will close the-.circuittozenergize .said motor-to-rotate'saideam wheel until said 'cam wheel` rotates 360 degrees bringing said knife-edges:- into contact whereuponsaidr lever will be swung laterally out. oisaidl cut-out-topermit droppingoff said coin.

3; A-coin-operated television set comprising a.-

cabinet of rectangular configuration, a.. large ver-- ticall gear journalled. in one side wall of said cabinet, an electricmotor supported onthe bot-f tom wall of said cabinet and carrying a small gear', an idler shaft mounted on said'cabinet and' havingla large gear in mesh with said small gear:

and' a-small gear'in mesh with said large gear for Y effecting slow'rotationof saidlargevertical gear by; saidmotor, a; cam wheel carried bysaid ver tical gear concentricallyl therewith, saidA camy wheel .having afsingle'thin cam having a lateral knife edge, a vertical clevis-rotatably mounted in and dependingr from the top wall of said cabinet; adjacent the-periphery ofsaid. vertical gear, a lever. rigid with said clevis for. rotation therewith, one end of said lever` having a vertical lknifeedge for coa'ction withv said cam knife edge, said, knifeedges slightly overlapping', a coin funnel' depending from said topwall adjacent said clevis. said funneli having onegside/wall cut-out..

toreceive. theother. end of said-l lever. by said..

rotation thereof, a, spring; normally urgingsaid. levenother end into said cut-out, a contactopr posite. said lever; other end adjacent said funnel and spaced therefrom. a distance4 less: than theD diameterv of a coin whereby a coin'y dropped said funnel'will bridgesaid lever other end and; said' conta-ct, until said. cam wheelv rotates 360;.: degrees to' bring said. knifef-edges in contact" whereupon saidlever will be svvunggg-laterally out.- ofsaid cut-out to permit dropping of said coin.,

4'.. A coin'f-operatedtelevision .set comprisingal cabinetofv rectangular configuration, a. large ver tical gear journalled in..one side walloisaidcab` inetl an electric motor supported. onthe bottom.. Wall A of said.. cabinet and. carrying'. a small. gear, an idler shaft mounted onv said cabinet and.hav-- ingffa large gearin mesh with said small` gear and ya-smallL gear-1in' mesh with said -largel gear for: eiecting slow rotationbfsaid large Vertical gear.` by said miotor,` a cam-'wheel 4carried by.. said .verm tical" gear. concentrically therewith said caml wheel having a` single thin cam*y havingA aulaterafl; knife edge at'thepeakv of beveledcam faces', af. vertical clevis rotatably mounted .inrand depending-from the top w-all of said'cabinet in line `with the vertical centerv of saidv vertical gear, a lever rigid with said clevis forvrotation therewith, one end of said lever having a vertical knife edge at the-peak`of`beveled camfaces for coaction with. saidl cam knifev edge; saidl knife 'edges slightly overlapping, afcoin funnel depending from said distance -lesstfthangtfhe diamet'eriof. a icoin; wherebya coin droppedi in said funnel. will/ bridge. said;

lever other.v end and.. said contact,and.a. circuit connecting saidF lever, Contact, m0tor,. anda source of powerv whereby saidA coin, on bridging.

saidflever and contact, Will closek the-.circuitv to energizesaid motor.` to rotatesaid cam. wheel until said cam wheelf rotates. 360 degreesfbringf.

ing said knife-edges into contact whereuponsaid. lever will beswung; laterally out of1said cut-out to permit dropping of said' coin.

-5. In a coin-operated television set including a-televisioncircuit, acabinet, a-f large cam wheel journalled in one side wall offsaid cabinet, anvelec Y tric motor supported onthe bottom wall of said cabinet; reduction gea-ring between saidA motor: and cam wheel for effecting.-slowfrotationbf.said. cam"` wheel-,f said cam=wheelhaving a single thin'- cam having a lateral cam edge, a lever pivotallyPV .mounted in thetop wall offsaid cabinet, one end of said lever-having avertical edge for coaction;

with saidcam edge; said camedgesslightlyover.- lapping, a coin funnel depending from said top Wallin linewith: saidrlever, said iunnelvhaving.Y one side wall cut-outtofreceivetheother endz of said lever, meansynormally urging.v said lever other end into said cut-out, a contact oppositel` said-.leverrotherj end adjacentA said funnel and spaced from-said lever a distances less than thediameter.` of a coinrwhereby a' coin dropped in` said funnel; will bridge said-leverIv other.- end and:

said contact, anda: circuit connecting together the televisioncircut; saidlever, contact, motor,Y and a source of power, whereby said: coin, on bridging said lever; and* contact; will close `the circuitfto: energize they-television circuit andY ,said

motor to rotate said cam wheel' untilv said cams: wheel rotates 360 degreesbringingssaid cam edges*A intocontact whereupon said lever will be swung laterally out; of.: said; cut-out topermit dropping.; of'said coin to open the circuit,'a video. station.

selector .iniA they television circuit, andvv anv elec::

electric motor supportedv on the. bottom Wall of' said cabinet, reduction gearingl between. said motor and cam wheel for'efecting slow rotation of said cam wheel; saidcamwheel having asin.-v gle thin cam having a lateral cam edge, a leverx' pivotally mounted in the top wall of said cabinet,

. one end of saidleverhaving a` vertical' edge forcoaction with said camf edge, said cam edges. slightly overlapping, a coinv funnel dependingv f-romi saidf. top..wall inline withv said; lever, said` funnel having. one sidewallcutout to receive e the other end of saidv lever,vmeansr` normally urgf-V ing. said. lever other. end intof said cut-out, a contact opposite* said; leverv other: end adij'acent saidfunnel and. spaced from said levery a distance lessrthanthe diameter of a coin whereby a coin dropped in said funnel will bridge said lever other end and' said contact;v and Vacircuit connecting together the television circuit, said lever, Contact, motor, and a source of power, whereby said coin, on bridging said lever andcontopiw-all inline lwith said clevis, said funnel hav- 7@ tact, will close the circuit to energize the tele-- ingone-Jsidewall-cut-out to receive the other end of said lever by said rotation thereof, a spring normally urgingvsaidflever other end into said cut-out, a'contact opposite saidlever other-end axjacentf saidY funnel and` spacedl therefrom a'y 75Y out to permit. dropping of said coin to open the:

vision circuit and said motor to` rotate said cam wheel until said cam wheel rotates 360 degrees bringing. said cam edges into contact whereupon said lever willbe swung laterally out of said cut-V circuit, a video station selector in the television circuit, and an electrically operated means connected in said circuit to be energized for locking said selector against rotation when a coin is inserted, said locking means, comprising a brake drum on said selector, and an electrically operated brake band engaged about said drum to be drawn tight when the coin is inserted.

7. In a coin-operated television set including a television circuit, a cabinet, a large cam wheel journalled in one side wall of said cabinet, an electric motor supported on the bottom wall of said cabinet, reduction gearing between said motor and cam wheel for effecting slow rotation of said cam wheel, said cam wheel having a single thin cam having a lateral cam edge, a lever pivotally mounted in the top wall of said cabinet, one end of said lever having a Vertical edge for coaction with said cam edge, said cam edges slightly overlapping, a coin funnel depending from said top wall in line with said lever, said funnel having one side wall cut-out to receive the other end of said lever, means normally urging said lever other end into said cut-out, a contact opposite said lever other end adjacent said funnel and spaced from said lever a distance less than `the diameter of a coin whereby a coin dropped in said funnel will bridge said lever other end and said contact, and a circuit connecting together the television circuit, said lever, contact, motor, and a source of power, whereby said coin, on bridging said lever and contact, will close the circuit to energize the television circuit and said motor to rotate said cam wheel until said cam wheel rotates 360 degrees bringing said cam edges into contact whereupon said lever will be swung laterally out of said cut-out to permit dropping of said coin to open the circuit, a video station selector in the television circuit, and an electrically operated means connected in said circuit to be energized for locking said selector against rotation when a coin is inserted, said locking means, comprising a brake drum on said selector, i an electrically operated brake band engaged about said drum to be drawn tight when the coin is inserted, and a solenoid connected in said circuit to be energized by insertion of said coin to effect the electrical operation of said brake band.

8. A coin-operated television set comprising a cabinet, a large cam wheel journalled in one side wall of said cabinet, an electric motor supported on the bottom wall of said cabinet, reduction gearing between said motor and cam wheel for effecting slow rotation of said cam wheel, said cam Wheel having a single thin cam having a lateral cam edge, a lever -pivotally mounted in 10 the top wall of said cabinet, one end of said lever having a vertical edge for coaction with said cam edge, said cam edges slightly overlapping, a coin funnel depending from said top wall in line with said lever, said funnel having one side wall cut-out to receive the other end of said lever, means normally urging said lever other end into said cut-out, a contact opposite said lever other end adjacent said funnel and spaced from said lever a distance less than the diameter of a coin whereby a coin dropped in said funnel will bridge said lever other end and said contact, and a circuit connecting said lever, contact, motor, and a source of power, whereby said coin, on bridging said lever and contact, will close the circuit to energize said motor to rotate said cam wheel until said cam wheel rotates 360 degrees bringing said cam edges into contact whereupon said lever will be swung laterally out of said cut-out to permit dropping of said coin, and a visual means for indicating when the allotted period for the inserted coin is about to be up, said visual means, comprising a switch operated by the cam of said cam wheel, a small red bulb, a source of power, and a circuit connecting said switch, bulb and source of power in series to illuminate said bulb when said switch is closed, and a dash pot for delaying the breaking of said last-mentioned circuit.

IRVING KORNBERG. ARTHUR BLOOM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 821,193 Rolph May 22, 1906 973,896 Trippensee Oct. 25, 1910 1,712,819 Freedman May 14, 1929 1,718,102 Bauer June 18, 1929 1,755,681 Zisch Apr. 22, 1930 1,766,354 Podrouzek June 24, 1930 1,788,203 Petterson Jan. 6, 1931 1,870,874 Sause Aug. 9, 1932 1,882,812 Gunn Oct. 18, 1932 2,015,411 Riley Sept. 24, 1935 2,150,324 Grunbaum Mar. 14, 1939 2,152,903 Mastini Apr. 4, 1939 2,358,604 Stewart Sept. 19, 1944 FOREIGN PATENTS Number Country Date 195,971 Great Britain Mar. 13, 1924 233,012 Great Britain May 7, 1925 

